/*!
 * HiShop string base64 encode decode
 *     HiShop.Base64.encode(HiShop.Base64.utf16to8(str));  
 *     HiShop.Base64.utf8to16(HiShop.Base64.decode(f.output.value));  
 * version: 1.0
 * build: Tue Aug 11 2015 11:16
 * author: CJZhao
 */

$(function () {
	HiShop.Base64 = HiShop.Base64 ? HiShop.Base64 : {}; //Base64 命名空间
	HiShop.Base64.base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
	HiShop.Base64.base64DecodeChars = new Array(-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1);


	HiShop.Base64.encode = function (str) {
		var out, i, len;
		var c1, c2, c3;
		len = str.length;
		i = 0;
		out = "";
		while (i < len) {
			c1 = str.charCodeAt(i++) & 0xff;
			if (i == len) {
				out += HiShop.Base64.base64EncodeChars.charAt(c1 >> 2);
				out += HiShop.Base64.base64EncodeChars.charAt((c1 & 0x3) << 4);
				out += "==";
				break;
			}
			c2 = str.charCodeAt(i++);
			if (i == len) {
				out += HiShop.Base64.base64EncodeChars.charAt(c1 >> 2);
				out += HiShop.Base64.base64EncodeChars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4));
				out += HiShop.Base64.base64EncodeChars.charAt((c2 & 0xF) << 2);
				out += "=";
				break;
			}
			c3 = str.charCodeAt(i++);
			out += HiShop.Base64.base64EncodeChars.charAt(c1 >> 2);
			out += HiShop.Base64.base64EncodeChars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4));
			out += HiShop.Base64.base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >> 6));
			out += HiShop.Base64.base64EncodeChars.charAt(c3 & 0x3F);
		}
		return out;
	}
	HiShop.Base64.decode = function (str) {
		var c1, c2, c3, c4;
		var i, len, out;
		len = str.length;
		i = 0;
		out = "";
		while (i < len) {
			/* c1 */
			do {
				c1 = HiShop.Base64.base64DecodeChars[str.charCodeAt(i++) & 0xff];
			}
			while (i < len && c1 == -1);
			if (c1 == -1)
				break;
			/* c2 */
			do {
				c2 = HiShop.Base64.base64DecodeChars[str.charCodeAt(i++) & 0xff];
			}
			while (i < len && c2 == -1);
			if (c2 == -1)
				break;
			out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));
			/* c3 */
			do {
				c3 = str.charCodeAt(i++) & 0xff;
				if (c3 == 61)
					return out;
				c3 = HiShop.Base64.base64DecodeChars[c3];
			}
			while (i < len && c3 == -1);
			if (c3 == -1)
				break;
			out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));
			/* c4 */
			do {
				c4 = str.charCodeAt(i++) & 0xff;
				if (c4 == 61)
					return out;
				c4 = HiShop.Base64.base64DecodeChars[c4];
			}
			while (i < len && c4 == -1);
			if (c4 == -1)
				break;
			out += String.fromCharCode(((c3 & 0x03) << 6) | c4);
		}
		return out;
	}

	/** 
	 * utf16转utf8 
	 * @param {Object} str 
	 */
	HiShop.Base64.utf16to8 = function (str) {
		var out, i, len, c;
		out = "";
		len = str.length;
		for (i = 0; i < len; i++) {
			c = str.charCodeAt(i);
			if ((c >= 0x0001) && (c <= 0x007F)) {
				out += str.charAt(i);
			}
			else
				if (c > 0x07FF) {
					out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));
					out += String.fromCharCode(0x80 | ((c >> 6) & 0x3F));
					out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
				}
				else {
					out += String.fromCharCode(0xC0 | ((c >> 6) & 0x1F));
					out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
				}
		}
		return out;
	}

	/** 
 * utf8转utf16 
 * @param {Object} str 
 */
	HiShop.Base64.utf8to16 = function (str) {
		var out, i, len, c;
		var char2, char3;
		out = "";
		len = str.length;
		i = 0;
		while (i < len) {
			c = str.charCodeAt(i++);
			switch (c >> 4) {
				case 0:
				case 1:
				case 2:
				case 3:
				case 4:
				case 5:
				case 6:
				case 7:
					// 0xxxxxxx  
					out += str.charAt(i - 1);
					break;
				case 12:
				case 13:
					// 110x xxxx 10xx xxxx  
					char2 = str.charCodeAt(i++);
					out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));
					break;
				case 14:
					// 1110 xxxx10xx xxxx10xx xxxx  
					char2 = str.charCodeAt(i++);
					char3 = str.charCodeAt(i++);
					out += String.fromCharCode(((c & 0x0F) << 12) | ((char2 & 0x3F) << 6) | ((char3 & 0x3F) << 0));
					break;
			}
		}
		return out;
	}


});